Higher Morales for Wu
When you form a army with Sun Ce, Sun Shang Xiang, Sun Quan you will get a boost of 10 morale.

Morale Boosts For Wei Generals
When forming an army, put Xiahou Dun, Xiahou Yuan, Cao Ren, and Cao Hong into the same unit. At the start of battle a dialogue will intiate with the four and each will receive a morale boost of 10. Keep these generals in the same unit for this to repeat every battle.